Motorola PMMN4128B RM780 Speaker Mic for APX N70

Motorola Original PMMN4128 RM780 IMPRES Remote Speaker Microphone

The Motorola PMMN4128 RM780 is a rugged, low-profile IMPRES remote speaker microphone designed for the Motorola APX N70, APX N50 and APX N30 radio families. It provides loud, clear received audio and convenient access to push-to-talk, emergency, volume and programmable controls without requiring the user to remove the radio from a belt or carrying case.

Engineered for public safety and demanding professional environments, the PMMN4128 combines an IP68-rated housing, wind-resistant microphone technology, a powerful 47mm speaker and a durable coiled cable. Its slim design makes it easier to wear on a uniform or vest than many larger public-safety microphones.

The current factory revision may be marked PMMN4128B. PMMN4128, PMMN4128A and PMMN4128B refer to revisions within the RM780 product family; confirm the exact revision and radio compatibility before ordering.

PMMN4128 Features and Benefits

• Genuine Motorola Original accessory
• Compatible with Motorola APX N70, APX N50 and APX N30 radios
• IMPRES audio technology
• Loud 47mm speaker
• Maximum rated speaker power of 3 watts
• Up to 102-phon output at maximum radio volume
• Omnidirectional microphone
• Motorola Windporting technology
• IP68-rated dust and water protection
• Prominent orange emergency button
• Two programmable side buttons
• Independent volume up/down control
• Large, protected push-to-talk button
• 3.5mm non-threaded receive-only audio jack
• Low-profile 360-degree rotating clip
• Integrated D-ring
• Hot Microphone support when enabled through radio programming
• Powered directly by the radio
• No separate microphone battery or pairing required
• Field-ready operating range from approximately -22°F to 140°F

Loud, Clear IMPRES Audio

The PMMN4128 RM780 incorporates Motorola IMPRES audio technology to optimize communication between the radio and microphone. IMPRES allows the compatible radio and microphone to work together as an integrated audio system, helping maintain consistent sound quality across different operating conditions.

Its large 47mm speaker delivers up to 3 watts of rated output, making incoming messages easier to hear around traffic, crowds, equipment and other environmental noise.

The PMMN4128 uses an omnidirectional microphone with Windporting technology. Windporting helps reduce the effect of wind moving across the microphone opening and assists with draining water away from the microphone element.

Integrated APX N70 Radio Controls

The RM780 places commonly used radio controls within easy reach on the speaker microphone:

• Large push-to-talk button
• Orange emergency button
• Volume-up and volume-down controls
• Two programmable side buttons

The programmable buttons can be assigned to supported radio functions through the radio’s programming. Available assignments depend on radio configuration and agency policy.

The PMMN4128 also supports Motorola’s Hot Microphone feature when enabled in the radio. After an emergency activation, Hot Microphone can allow transmission for a programmed period without requiring the user to hold the push-to-talk button.

Motorola states that the RM780 does not support ViQi Voice Control. Buyers who require a dedicated ViQi button should consider the XVP750, XVP730 or WM800, subject to radio configuration.

IP68-Rated Construction

The Motorola PMMN4128 carries an IP68 rating for resistance to dust and water under Motorola’s specified test conditions. This rugged construction makes it suitable for law enforcement, emergency response, utilities, transportation and outdoor field operations.

Always inspect the microphone connector, cable, housing and audio-jack cover before use. Covers must be closed correctly to maintain the intended environmental protection.

3.5mm Receive-Only Earpiece Port

A 3.5mm non-threaded audio jack allows users to connect a compatible receive-only earpiece for more private listening. This can be useful in public areas, security operations or environments where radio traffic should not be broadcast through the external speaker.

The microphone continues to provide push-to-talk and transmit functions while received audio is directed to the connected earpiece.

Compatible Motorola Radios

The PMMN4128 RM780 with the appropriate connector is compatible with:

• Motorola APX N70
• Motorola APX N70 XE configurations, when listed by Motorola
• Motorola APX N50
• Motorola APX N30
• Motorola MOTOTRBO R7
• Motorola MOTOTRBO Ion

This listing focuses on its use with the APX N70. Confirm the complete radio model and microphone revision because Motorola radio families can use different accessory connectors even when a microphone shares the RM780 name.

PMMN4128 Specifications

PMMN4128 Compared With Other APX N70 Speaker Microphones

PMMN4128 vs. PMMN4158 WM800

The Motorola PMMN4158 WM800 is a wireless speaker microphone. It eliminates the cable between the APX N70 and microphone, giving users greater freedom when the radio is worn beneath protective clothing or in a location that is difficult to reach.

The WM800 uses four HDR microphones, adaptive noise suppression and a replaceable rechargeable battery. It also offers a task light, emergency control, programmable buttons and supported ViQi access.

The PMMN4128 connects directly to the radio and draws power from the radio battery. It requires no Bluetooth pairing, separate battery or microphone charging. This makes it simpler to manage and removes the risk of a depleted wireless-microphone battery.

Choose the PMMN4128 for: wired reliability and no separate battery management.

Choose the PMMN4158 for: wireless mobility and advanced multi-microphone audio.

Which APX N70 Speaker Microphone Is Best?

The right microphone depends on how the APX N70 will be used:

• Choose the PMMN4128 RM780 for a compact, dependable and cost-effective wired microphone.
• Choose the PMMN4158 WM800 when cable-free operation is the highest priority.

Frequently Asked Questions

Is the PMMN4128 compatible with the Motorola APX N70?

Yes. The PMMN4128 RM780 is an approved remote speaker-microphone option for the APX N70 when supplied with the correct connector and revision.

Is the PMMN4128 waterproof?

The PMMN4128 is IP68 rated for dust and water protection under Motorola’s specified testing conditions.

Does the PMMN4128 have an emergency button?

Yes. It includes a prominent orange emergency button. Emergency operation depends on radio programming and system configuration.

Does the RM780 have programmable buttons?

Yes. Two side buttons can be programmed for supported radio functions.

Does the PMMN4128 support ViQi?

No. Motorola’s support information states that the RM780 does not support ViQi Voice Control. Consider the XVP750, XVP730 or WM800 if ViQi is required.

Does the PMMN4128 require charging?

No. The wired RM780 draws power from the connected radio and does not have a separate rechargeable battery.

Can an earpiece be connected?

Yes. The PMMN4128 has a 3.5mm non-threaded jack for a compatible receive-only earpiece.

Order the Motorola PMMN4128 RM780 Speaker Microphone

The Motorola Original PMMN4128 RM780 gives APX N70 users a practical combination of loud audio, compact construction, IP68 protection and essential radio controls. Its emergency button, programmable functions, volume control and private-listening port make it a dependable choice for everyday public-safety and professional communication.